Wordnet 3.0
NOUN (2)
1. 
 an unnaturally frenzied or distraught woman; 
2. 
 (Greek mythology) a woman participant in the orgiastic rites of Dionysus; 
The Collaborative International Dictionary of English v.0.48:
Maenad \Mae"nad\, n. [L. Maenas, -adis, Gr. ?, ?, fr. ? to
   rave.]
   1. A Bacchante; a priestess or votary of Bacchus.
      [1913 Webster]
   2. A frantic or frenzied woman.
      [1913 Webster]
WordNet (r) 3.0 (2006):
maenad
    n 1: an unnaturally frenzied or distraught woman
    2: (Greek mythology) a woman participant in the orgiastic rites
       of Dionysus